Tracing Nested Calls with a Decorator

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Write a decorator factory trace(log) where log is a list that receives lines. Each traced call appends:

on entry: "{indent}→ name(args)", with arguments formatted with repr (positional first, then key=value), comma-separated
on return: "{indent}← name = result" (using repr)
if it raises: "{indent}✗ name raised ExceptionName", then re-raise

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solution.py · Python 3.13

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Tracing Nested Calls with a Decorator · TechGradify